A total of 10 Santa Barbara County Jail inmates have now tested positive for COVID-19.
Sheriff's officials say four of those cases were confirmed Thursday.
Three of the inmates were reportedly housed in general popular and one was in the intake quarantine area.
The sheriff's office says previous cellmates of the inmates who tested positive are now under quarantine and will be monitored for symptoms and re-tested.
Of the 10 positive cases among inmates, three have been released from custody, six are in isolation and being treated and one has recovered, according to the sheriff's office.
The sheriff's office says it also learned Thursday that one of its custody deputies tested positive for COVID-19.
The employee last worked on Tuesday and the sheriff's office says they were tested as part of ongoing testing of staff at the jail.
"The custody deputy had contact with inmates while at work and was required to wear a mask during all of those interactions," according to a press release.
To date, 33 sheriff's office employees have tested positive for COVID-19 since the start of the pandemic. All but 11 have reportedly recovered and returned to work.
The five new cases the sheriff's office were informed of Thursday were among 224 new COVID-19 cases reported in Santa Barbara County July 16.